![]() Louise Wolff, an American cardiologist who described the WPW syndrome with Parkinson and White, was probably the first person to measure the QT interval. The importance of the QT interval did not come to light for several decades after the invention of the ECG by Willem Einthoven in the early 20 th century. It has significant clinical importance, as there is a correlation between the QT interval length and the risk of developing ventricular tachyarrhythmias. QT interval measurement is one of the most important aspects of any electrocardiogram (ECG) evaluation. This review will focus on how to accurately measure the QT interval and how to avoid common pitfalls. Prolonged QRS duration in cases such as paced rhythm, LVH and conduction abnormalities pose significant challenges in accurately measuring the QT interval. ![]() Accurate measurement is essential for many clinical decision-making situations, which can significantly affect patient outcomes. The QT interval represents the time it takes for the ventricles to depolarize and repolarize.
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